Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
From: Steven Rostedt <rostedt@xxxxxxxxxxx>
Date: Wed, 8 Nov 2023 09:50:24 -0500
Cc: Ankur Arora <ankur.a.arora@xxxxxxxxxx>, Yosry Ahmed <yosryahmed@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, paulmck@xxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, luto@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, mingo@xxxxxxxxxx, juri.lelli@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, mgorman@xxxxxxx, jon.grimm@xxxxxxx, bharata@xxxxxxx, raghavendra.kt@xxxxxxx, boris.ostrovsky@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx, jgross@xxxxxxxx, andrew.cooper3@xxxxxxxxxx, mingo@xxxxxxxxxx, bristot@xxxxxxxxxx, mathieu.desnoyers@xxxxxxxxxxxx, geert@xxxxxxxxxxxxxx, glaubitz@xxxxxxxxxxxxxxxxxxx, anton.ivanov@xxxxxxxxxxxxxxxxxx, mattst88@xxxxxxxxx, krypton@xxxxxxxxxxxxxxxxxxx, David.Laight@xxxxxxxxxx, richard@xxxxxx, mjguzik@xxxxxxxxx, SeongJae Park <sj@xxxxxxxxxx>, Mike Kravetz <mike.kravetz@xxxxxxxxxx>, Muchun Song <muchun.song@xxxxxxxxx>, Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, Shakeel Butt <shakeelb@xxxxxxxxxx>, Naoya Horiguchi <naoya.horiguchi@xxxxxxx>, Miaohe Lin <linmiaohe@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Oscar Salvador <osalvador@xxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, Dennis Zhou <dennis@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>, Minchan Kim <minchan@xxxxxxxxxx>, Seth Jennings <sjenning@xxxxxxxxxx>, Dan Streetman <ddstreet@xxxxxxxx>
In-reply-to: <ZUuGCekSB727c61n@casper.infradead.org>
References: <20231107215742.363031-1-ankur.a.arora@oracle.com> <20231107230822.371443-1-ankur.a.arora@oracle.com> <20231107230822.371443-12-ankur.a.arora@oracle.com> <20231108012823.GD11577@google.com> <7155f21f-a7e5-cc36-89e5-c1ce257b9420@suse.cz> <CAJD7tkYYqqYT361pbeqTFxoAep2qtTAWSQx4SzFCcEEOZgRT3Q@mail.gmail.com> <87sf5gocas.fsf@oracle.com> <ZUuGCekSB727c61n@casper.infradead.org>

On Wed, 8 Nov 2023 12:58:49 +0000
Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:

> > Good point. We actually do have exactly that: cond_resched_lock(). (And
> > similar RW lock variants.)  
> 
> That's a shame; I was going to suggest calling it spin_cycle() ...

  Then wash.. rinse.. repeat!

-- Steve

References:
- [RFC PATCH 00/86] Make the kernel preemptible
  - From: Ankur Arora
- [RFC PATCH 57/86] coccinelle: script to remove cond_resched()
  - From: Ankur Arora
- [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Ankur Arora
- Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Sergey Senozhatsky
- Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Vlastimil Babka
- Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Yosry Ahmed
- Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Ankur Arora
- Re: [RFC PATCH 68/86] treewide: mm: remove cond_resched()
  - From: Matthew Wilcox

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